Finding the equation of hyperbola

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Find the equation of the hyperbola with vertices $(\pm 6, 0)$ and one of the directrix is $x=4$.

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Hint:

What's the center of the hyperbola?

What are equations of major & minor axes?

If the required equation is $$\dfrac{x^2}{a^2}-\dfrac{y^2}{b^2}=1,$$

$a=6$

What are the equation of the directrixes?